Solana
Solana is the default first chain in Dexter. The facilitator sponsors transaction fees, enforces sponsor policy, and supports smart wallets — buyers only need USDC, not SOL.
Network IDs
| Network | CAIP-2 identifier | Status |
|---|---|---|
| Solana Mainnet | solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp | Production |
| Solana Devnet | solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1 | Testnet |
Why Solana Is the Default
Buyers don't need SOL
The facilitator signs as fee payer on every Solana transaction. Buyers pay in USDC only — they never need to hold or spend SOL. This is the cleanest onboarding path for agents and end users.
Solana is where the facilitator's value is most visible:
- Fee sponsorship — the facilitator pays all transaction fees, not the buyer
- Sponsor policy — strict validation before the facilitator will sign (not a blind relayer)
- Smart wallet support — ERC-4337-style verification for agent wallets
- Most battle-tested — majority of x402 traffic settles here
Token Details
| Property | Mainnet | Devnet |
|---|---|---|
| USDC mint | EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v | Devnet USDC (faucet) |
| Decimals | 6 | 6 |
| Fee payer | DEXVS3su4dZQWTvvPnLDJLRK1CeeKG6K3QqdzthgAkNV | Same |
The fee payer address appears in your transaction as the account paying SOL fees. You don't need to fund it — the facilitator manages its own balance.
What The Facilitator Actually Checks
On Solana, the facilitator is not a blind relayer. It enforces sponsor policy before signing as fee payer:
- Allowed programs only — SPL Token, Token-2022, ComputeBudget, Memo, Phantom Lighthouse. Everything else is rejected.
- Compute caps — max 200,000 CU (400,000 for smart wallets), max 50,000 microlamport priority fee
- Asset allowlist — only USDC by default
- Minimum payment — 0.01 USDC (10,000 atomic units)
- Recipient / mint / amount matching — must satisfy the payment requirements exactly
If your transaction is rejected, check the errorCode in the response. See Sponsor Policy for the full rules and Troubleshooting for common fixes.
Best Fit
- merchants starting with their first paid endpoint
- buyers or agents already operating on Solana
- teams that want fee-sponsored UX for low-value calls
- anyone who wants the most battle-tested Dexter settlement path
Quick Support Check
Validate Before Shipping
- Confirm you are using the correct Solana CAIP-2 identifier.
- Confirm the payment requirements use the USDC mint (
EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v) and your pay-to address. - Confirm the transaction shape satisfies sponsor policy.
- Test
POST /verifyandPOST /settlewith a real Solana-targeted payment.